Tef.
I've noticed the berries already ripening and falling off so I'd say as soon as all this rain stops go for it.
The way I dig is using a small mattock and if it's a pretty good sized patch I'll get on my knees digging pulling a sack (duffle bag) with me. This sure saves my back.
When I get home I wash the roots in a cement mixer (drum type) about 3 different rinses to get them good and clean. You can dry them in the attic or in any warm dry area.
rootman